Change the currency symbol

To change the currency symbol on the front-end you can use the hook apply_filters( ‘babe_currency_symbol’, $currency_symbol, $currency_code ):

add_filter( 'babe_currency_symbol', 'customtheme_babe_currency_symbol', 10, 2 );
function customtheme_babe_currency_symbol( $currency_symbol, $currency_code ){
     if ( $currency_code === 'USD' ){
         $currency_symbol = 'USD';
     }
     return $currency_symbol;
}